diff --git a/app/serializers/ai_topic_summary_serializer.rb b/app/serializers/ai_topic_summary_serializer.rb
index 39d3abff..738f843e 100644
--- a/app/serializers/ai_topic_summary_serializer.rb
+++ b/app/serializers/ai_topic_summary_serializer.rb
@@ -1,7 +1,12 @@
 # frozen_string_literal: true
 
 class AiTopicSummarySerializer < ApplicationSerializer
-  attributes :summarized_text, :algorithm, :outdated, :can_regenerate, :new_posts_since_summary
+  attributes :summarized_text,
+             :algorithm,
+             :outdated,
+             :can_regenerate,
+             :new_posts_since_summary,
+             :updated_at
 
   def can_regenerate
     scope.can_request_summary?
diff --git a/assets/javascripts/discourse/connectors/topic-map-expanded-after/ai-summary-box.gjs b/assets/javascripts/discourse/connectors/topic-map-expanded-after/ai-summary-box.gjs
index 9727c8a4..69b2ac3e 100644
--- a/assets/javascripts/discourse/connectors/topic-map-expanded-after/ai-summary-box.gjs
+++ b/assets/javascripts/discourse/connectors/topic-map-expanded-after/ai-summary-box.gjs
@@ -123,7 +123,7 @@ export default class AiSummaryBox extends Component {
       })
       .then(() => {
         if (update.done) {
-          this.summarizedOn = shortDateNoYear(topicSummary.summarized_on);
+          this.summarizedOn = shortDateNoYear(topicSummary.updated_at);
           this.summarizedBy = topicSummary.algorithm;
           this.newPostsSinceSummary = topicSummary.new_posts_since_summary;
           this.outdated = topicSummary.outdated;